The SEI homepage does a fuel comparison sheet every now and then. Thanks heaven I copyed the last one from October 2005, it disapeared thereafter and was replaced with an even more outdated version from April 2005 . Bulk LPG was given on the October sheet with € 0.57 per liter.
I guess the numbers are suplied to the SEI by the two major players Flogas and Calorgas.
I think that because the July sheet (copied as well!) from the first of July 2005 showed a liter price of € 0.51 incl. VAT on the SEI fuel comparison sheet, the data was propably collected the month before. But I paid in June only €0.397 incl. VAT per liter with Tervas. So Calorgas was over 25 % more expensive , charging at the time € 51.47 per liter !!! Flogas, which still wanted to give me their "special rate " , gave me a price of € 0.436 ( 10% more expensive!!). All prices where given to me within the 10 minutes during which I made the calls.
A tank of 2000 liter would put you in an even stronger buyer position to get the best offer, who want's to miss such an order ?
I think Tervas would deliver to other areas as well, home heating is not the only use for LPG , motoring and industry depends on it as well. But better phone and ask yourself.